hey I have a 29 gallon thats been set up for about 1 month now, it has 2 clowns, a bi colored blenny, and a pepperemint shrimp, is there anything else i can stick in it?
The firefish, and wrasses can be jumpers, so you will need to cover your tank to keep them in it.
The Dottybacks, (Psuedochromis) and the pygmy angels can be territorial monsters, and should be the last critters in the tank.
The Cardinal fish may not be as pretty as the others, but they will school together when placed in the tank...so three of them in you tank would look nice.
Hope those suggestions help. This was by no means a be all end all list....just down and dirty to show you what all is out there.